CN107895609B - A method of increasing high voltage power cable service voltage type - Google Patents
A method of increasing high voltage power cable service voltage type Download PDFInfo
- Publication number
- CN107895609B CN107895609B CN201711131094.6A CN201711131094A CN107895609B CN 107895609 B CN107895609 B CN 107895609B CN 201711131094 A CN201711131094 A CN 201711131094A CN 107895609 B CN107895609 B CN 107895609B
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- voltage
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- metal sleeve
- conductor
- power cable
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 36
- 229910052751 metal Inorganic materials 0.000 claims abstract description 36
- 239000004020 conductor Substances 0.000 claims abstract description 29
- 230000005611 electricity Effects 0.000 claims abstract description 5
- 238000004364 calculation method Methods 0.000 claims description 10
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 239000010931 gold Substances 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 34
- 239000011229 interlayer Substances 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/028—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients with screen grounding means, e.g. drain wires
Abstract
A method of increasing high voltage power cable service voltage type.It include cylinder single high voltage power cable insulating layer inside radius be c position add a metal sleeve；The center of circle of the normal direction projection circle of metal sleeve is overlapped with the center of circle of conductor；Metal sleeve built in cylinder single high voltage power cable is connect by connecting terminal with low-voltage device in switchgear, as low-voltage alternating current power supply to low-voltage device power supply.Effect of the present invention: low-voltage alternating current power supply needed for low-voltage device directly draws from high-tension cable built-in metal casing and connects in switchgear, can simplify low-pressure system in original substation, saves the costs of equipment such as station local coordinate frame, low-voltage alternating-current screen；Control number of cables and its fee of material and operating expenses are greatly reduced, electricity transmitting and converting construction cost of investment is effectively reduced；Prevent to lead to the accident risk of low-voltage device power loss in switchgear because the low-tension supply in substation breaks down.
Description
Technical field
The invention belongs to power supply technical fields, more particularly to a kind of increase high voltage power cable service voltage type
Method.
Background technique
Currently used cylinder single high voltage power cable mainly include conductor, the insulating layer being coated on outside conductor and
The grounded metallic shield layer being coated on outside insulating layer.But this traditional cylinder single high voltage power cable can only provide one kind
Operating voltage, the voltage determine the thickness of insulating layer, numerically directly proportional to the logarithm of thickness of insulating layer.For being arranged in
For the switchgear at high voltage power cable both ends, power supply needed for internal all kinds of low-voltage devices can not directly be powered by cable,
Also need the low-tension supply in Yin Jie substation.This can bring two problems: one, causing secondary connection in substation complicated, and connect
The material of line and construction will all cause cost of investment to increase；If two, the low-tension supply in substation breaks down, institute will lead to
There is device power loss in switchgear, is easy proximity switch malfunction or tripping, this can all expand accident range, cause unnecessary damage
It loses.And therefore state's net almost can all sustain a great loss every year.
Summary of the invention
To solve the above-mentioned problems, the purpose of the present invention is to provide a kind of increase high voltage power cable service voltage types
Method.
In order to achieve the above object, the method provided by the invention for increasing high voltage power cable service voltage type includes pressing
The following steps that sequence carries out:
Step 1) is by conductor, the insulating layer being coated on outside conductor and the grounded metal screen being coated on outside insulating layer
A metal sleeve is added in the position that the insulating layer inside radius for covering the cylinder single high voltage power cable of layer composition is c；Metallic sheath
The center of circle of the normal direction projection circle of pipe is overlapped with the center of circle of conductor, and the radius c for adjusting metal sleeve can change metal sleeve and connect
The voltage value of ground metallic shield interlayer enables single cylinder single high voltage power cable to provide multiple voltage simultaneously；
Metal sleeve built in cylinder single high voltage power cable is passed through low pressure in connecting terminal and switchgear by step 2)
Device connection is powered as low-voltage alternating current power supply to low-voltage device；It is built-in by this while meeting high voltage power transmission demand
Metal sleeve is powered to the low-voltage device of the inside switch cabinet at both ends.
In step 1), the calculation formula of the radius c of the metal sleeve are as follows:
In formula: U2: the voltage value of metal sleeve and grounded metallic shield interlayer, calculation formula are as follows:
Umax: the maximum working voltage of conductor and grounded metallic shield interlayer, calculation formula are as follows:
A: the radius of conductor
B: the radius of grounded metallic shield layer.
The method provided by the invention for increasing high voltage power cable service voltage type has the following beneficial effects:
One, low-voltage alternating current power supply needed for low-voltage device directly draws from the metal sleeve built in high-tension cable and connects in switchgear,
Low-pressure system in original substation can be simplified, the costs of equipment such as station local coordinate frame, low-voltage alternating-current screen are saved；It drops significantly
Low control number of cables and its fee of material and operating expenses, effectively reduce electricity transmitting and converting construction cost of investment；
Two, prevented to lead to the thing of low-voltage device power loss in switchgear because the low-tension supply in substation breaks down
Therefore risk.Every cable is independently-powered, will not occur because of the accident that certain line fault causes substation all to have a power failure；
Three, secondary connection in substation is simplified, wiring error rate is reduced, accelerates engineering construction progress.
Detailed description of the invention
Fig. 1 is high by the applicable cylinder single of the method provided by the invention for increasing high voltage power cable service voltage type
Piezoelectric forces cable normal direction perspective view.
In figure: 1, grounded metallic shield layer, 2, insulating layer, 3, conductor, 4, built-in casing.
Specific embodiment
In the following with reference to the drawings and specific embodiments to increase high voltage power cable service voltage type provided by the invention
Method is described in detail.
The method provided by the invention for increasing high voltage power cable service voltage type includes the following step carried out in order
It is rapid:
Step 1) by conductor, the insulating layer being coated on outside conductor and is coated on outside insulating layer as shown in Figure 1
Grounded metallic shield layer composition cylinder single high voltage power cable 2 inside radius of insulating layer be c position add a gold
Belong to casing 4；The center of circle of the normal direction projection circle of metal sleeve 4 is overlapped with the center of circle of conductor 3, and the radius c for adjusting metal sleeve 4 can
Under the premise of insulating materials dosage is constant, changes the voltage extremity distribution situation in insulating layer 2, make cylinder single high-tension electricity
Cable can provide multiple voltage simultaneously；
Metal sleeve 4 built in cylinder single high voltage power cable is passed through low pressure in connecting terminal and switchgear by step 2)
Device connection is powered as low-voltage alternating current power supply to low-voltage device；It is built-in by this while meeting high voltage power transmission demand
Low-voltage device power supply of the metal sleeve 4 to the inside switch cabinet at both ends.
In step 1), the calculation method of the radius c of the metal sleeve 4 is as follows:
Following parameters are set first:
A: the radius of conductor 3；
B: the radius of grounded metallic shield layer 1；
EM: the breakdown field strength of insulating layer 2；
τ: the unit length charge of conductor 3；
ε: the dielectric constant of insulating layer 2,
σb: the inner surface surface density of charge of grounded metallic shield layer 1；
C: the radius of metal sleeve 4；
U: the voltage between conductor 3 and grounded metallic shield layer 1；
U2: the voltage between metal sleeve 4 and grounded metallic shield layer 1；
1.1) when calculating non-built-in metal casing, the maximum working voltage of cylinder single high voltage power cable inner conductor 3:
Conductor 3 is in the electric field strength that radius is at r are as follows:
Wherein,For unit direction vector, direction is to be directed toward infinite point by the center of circle of conductor 3.
In the electric field strength extreme value that the edge of conductor 3 obtains are as follows:
Voltage between conductor 3 and grounded metallic shield layer 1:
To make full use of insulating materials, make Emax=EM, then the maximum working voltage between conductor 3 and grounded metallic shield layer 1
Are as follows:
1.2) after calculating built-in metal casing 4, the voltage extremity between metal sleeve 4 and grounded metallic shield layer 1:
Voltage computing formula between metal sleeve 4 and grounded metallic shield layer 1 are as follows:
Voltage value when r=c, between metal sleeve 4 and grounded metallic shield layer 1 are as follows:
By formula 6. it is found that U2It is only related with the radius c of metal sleeve 4, adjust the radius c of metal sleeve 4, thus it is possible to vary gold
Belong to the voltage value U between casing 4 and grounded metallic shield layer 12Numerical value.
It is derived, determines the calculation formula of the radius c of metal sleeve 4 are as follows:
In formula: U2: the voltage value between metal sleeve 4 and grounded metallic shield layer 1, calculation formula are as follows:
Umax: the maximum working voltage between conductor 3 and grounded metallic shield layer 1, calculation formula are as follows:
A: the radius of conductor 3
B: the radius of grounded metallic shield layer 1.
It is said by taking crosslinked polyetylene insulated polyvinyl chloride boot power cable YJV-35kV-1 × 50 of copper core as an example below
It is bright, major parameter are as follows: 3. a=4mm, b=39mm are then obtained by formula:
Assuming that voltage needed for its inside switch cabinet low-voltage device is 220V, then 6. obtained by formula:
To sum up, the metal sleeve that one layer of radius is 38.04mm is added in the insulating layer 2 of cylinder single high voltage power cable
4, which can provide 220V voltage, after busbar is transferred, use for the low-voltage device of inside switch cabinet.
Claims (1)
1. a kind of method for increasing high voltage power cable service voltage type, it is characterised in that: the increase high-tension electricity electricity
The method of cable service voltage type includes the following steps carried out in order:
Step 1) is by conductor, the insulating layer being coated on outside conductor and the grounded metallic shield layer being coated on outside insulating layer
Insulating layer (2) inside radius of the cylinder single high voltage power cable of composition is that a metal sleeve (4) is added in the position of c；Metal
The center of circle of the normal direction projection circle of casing (4) is overlapped with the center of circle of conductor (3), and the radius c for adjusting metal sleeve (4) can change gold
Belong to the voltage value between casing (4) and grounded metallic shield layer (1), single cylinder single high voltage power cable is enable to provide simultaneously
Multiple voltage；
Step 2) fills the metal sleeve (4) built in cylinder single high voltage power cable by low pressure in connecting terminal and switchgear
Connection is set, is powered as low-voltage alternating current power supply to low-voltage device；While meeting high voltage power transmission demand, pass through the built-in gold
Belong to casing (4) to the low-voltage device power supply of the inside switch cabinet at both ends；
In step 1), the calculation formula of the radius c of the metal sleeve (4) are as follows:
In formula: U2: the voltage value between metal sleeve (4) and grounded metallic shield layer (1), calculation formula are as follows:
τ: the unit length charge of conductor (3)；
ε: the dielectric constant of insulating layer (2)；
Umax: the maximum working voltage between conductor (3) and grounded metallic shield layer (1), calculation formula are as follows:
A: the radius of conductor (3)
B: the radius of grounded metallic shield layer (1)
EM: the breakdown field strength of insulating layer (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711131094.6A CN107895609B (en) | 2017-11-15 | 2017-11-15 | A method of increasing high voltage power cable service voltage type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711131094.6A CN107895609B (en) | 2017-11-15 | 2017-11-15 | A method of increasing high voltage power cable service voltage type |
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| Publication Number | Publication Date |
|---|---|
| CN107895609A CN107895609A (en) | 2018-04-10 |
| CN107895609B true CN107895609B (en) | 2019-05-28 |
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| CN201711131094.6A Active CN107895609B (en) | 2017-11-15 | 2017-11-15 | A method of increasing high voltage power cable service voltage type |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375376A (en) * | 2015-09-01 | 2016-03-02 | 上海大华电器设备有限公司 | Combined substation electrical switch cabinet |
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2017
- 2017-11-15 CN CN201711131094.6A patent/CN107895609B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375376A (en) * | 2015-09-01 | 2016-03-02 | 上海大华电器设备有限公司 | Combined substation electrical switch cabinet |
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| CN107895609A (en) | 2018-04-10 |
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